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Assessment of a closed thermochemical energy storage using energy and exergy methods

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  • Abedin, Ali Haji
  • Rosen, Marc A.

Abstract

Thermal energy storage (TES) is an important technology for achieving more efficient and environmentally benign energy systems. Thermochemical TES is a type of TES with the potential for high energy density and is only recently being considered intensively. To improve understanding of thermochemical TES systems and their implementation, energy and exergy analyses are beneficial. Here, thermodynamics assessments are presented for a general closed thermochemical TES system, including assessments and comparisons of the efficiencies of the overall thermochemical TES cycle and its charging, storing and discharging processes. Locations and causes of thermodynamic losses in thermochemical TES systems are being specified using exergy analysis. The analytical methodology applied in this study identifies that energy and exergy efficiencies differ for thermochemical TESs, e.g. the energy efficiency for a case study is approximately 50% while the exergy efficiency is about 10%. Although the focus is to evaluate thermodynamic efficiencies, other design parameters such as cost, and environmental impact also need to be examined in assessing thermochemical storage. The efficiencies for thermochemical TES provided here should be helpful for designing these energy systems and enhancing their future prospects.

Suggested Citation

  • Abedin, Ali Haji & Rosen, Marc A., 2012. "Assessment of a closed thermochemical energy storage using energy and exergy methods," Applied Energy, Elsevier, vol. 93(C), pages 18-23.
    • Handle: RePEc:eee:appene:v:93:y:2012:i:c:p:18-23
    DOI: 10.1016/j.apenergy.2011.05.041
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    References listed on IDEAS

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